The Ball Sort Puzzle is a problem in which you are tasked with sorting the different colored balls that are contained inside the tubes.
You won't be able to stack one ball on top of another if they are of the same color and the tubes through which they will pass have enough room between the balls for there to be a gap between them. Just clicking on the tube will allow you to swap out the ball that was previously inside. You get a certain amount of coins after completing each level.
Collect money and use them to buy new tube skins. This free mental exercise may be found on the internet and requires you to move one ball at a time. In order to go to the next level, each flask must be completely filled or emptied out with balls of the same hue.